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DRIVELINE FAMILY

Renault/Stellantis EAT8 Transmission / Driveline Family

EAT8 family transmission type, ratio/speed class, drivetrain layout and diagnostic approach.

Technical identity

Manufacturer group
Renault/Stellantis
Transmission family
EAT8
Type
torque converter auto
Speeds / ratio
8
Drivetrain layout
FWD/AWD

What to separate first in diagnosis

  • Test electronic control, hydraulic pressure, clutch/converter and mechanical driveline behaviour separately.
  • Temperature and fluid level/condition can directly affect pressure regulation and adaptation behaviour.
  • Verify software, mechatronic and ratio variants within the same family by exact application/part identity.
TRANSMISSION DIAGNOSTIC FLOW

Measurement sequence

  1. Confirm exact transmission code and software/application variant.
  2. Verify fluid level, condition and temperature.
  3. Capture input/output speeds and actual ratio.
  4. Test electronic command, hydraulic pressure and mechanical clutch separately.
  5. Verify shift/adaptation result under load.

Source-verified powertrain relationships

The relationships below come only from existing curated relation records; they are not exact vehicle/model fitment claims.

curated_relationEB2 PureTech

Stellantis transverse

curated_relationDV5 BlueHDi

Stellantis diesel

DRIVELINE DIAGNOSTIC DEPTH

Mechanical-hydraulic-electronic architecture

  • On torque-converter automatics, TCC slip, input/output speeds, commanded/actual ratio, fluid temperature and line-pressure control are tracked separately.
  • In AWD/4x4, tire circumference, transfer/differential, wheel speeds and torque-distribution request are kept as separate mechanical/electronic evidence.

Driveline live-data package

  • Freeze frame: first/last fault time, RPM, load, vehicle speed, system voltage, core temperatures and companion DTCs.
  • Driveline: input/output speeds, commanded/actual ratio, clutch/TCC slip, fluid temperature, actuator/solenoid command and adaptations.
  • Chassis/traction: four wheel speeds, steering angle, yaw/acceleration and AWD torque request/feedback on the same time base.

Driveline measurement chain

  1. 1) Match vehicle/generation/market/powertrain/driveline identity to the source record; family name alone is not fitment evidence.
  2. 2) Preserve freeze frame and companion DTCs before clearing; make the first-fault condition reproducible.
  3. 3) Verify power/ground and network communication under load; do not decide from key-on static measurement alone.
  4. 5) Compare electronic command → hydraulic/actuator response → mechanical slip/ratio result at the same temperature and load.
  5. 6) After repair, recreate the same load/temperature and verify DTC state, live-data deviation and user symptom together.

Fluid type/level temperature, pressure thresholds, adaptation limits and part codes are not asserted without application-specific OEM evidence.

Driveline root-cause split

  • On torque-converter automatics, separate TCC slip from actual gear-ratio error; temperature-dependent line-pressure/solenoid behavior can mimic mechanical clutch faults.
  • For AWD binding/warning complaints, exclude tire-circumference or wheel-speed mismatch before condemning transfer/differential hardware.
Sources & freshness

Sources & freshness

Exact technical values, prices and failure rates are not invented without verified vehicle/manufacturer evidence.

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